Amplitude sieve
The amplitude filter is a circuit part of a television set or some screens . Its task is to separate the synchronization information of the television signal from the picture content information.
In the early days of television technology, the separation of the synchronous information from the picture content was implemented using simple clamping circuits. The circuit complexity was kept within limits, but interference pulses could pass the amplitude filter. The DC voltage component of the image signal, which fluctuates depending on the image content, had an equally disadvantageous effect. This made the clamping circuit unreliable.
For better interference suppression, later circuits were implemented as a coincidence stage . The synchronous pulses were only used for fine synchronization if the received pulses arrived at the same time as the pulses from the line deflection stage.
literature
- Heinz Richter: TV for everyone . Franckh'sche Verlagshandlung W. Keller & Co., Stuttgart 1952.
- Otto Limann: TV technology without ballast . Franzis-Verlag, Munich 1969.